Cut-off valve



(No Model.) A f 2 sheets-sheet 2.

0. NOLL.

GUT-OPP VALVE. No. 375,090. Patented Dec. 20, 1887.

UNITED STATES PATENT OFFICE.,

OTTO NOLL, OF BERLIN, GERMANY, ASSIGNOR TO PAUL BRENNIOKE & CO.,

- OF SAME PLACE.

cur-oFF VALVE.

SPECIFICATION forming part of Letters Patent No. 375,090, dated December 20, 1887.

Application filed June 30, 1887. Serial No. 242,985.

To all whom it may concern,.-

Be it known that l, O'r'ro NOEL, a resident ofthe city of Berlin, in the Kingdom of Prussla, Germany, have invented some new and useful Improvements in CutOff Valves and Valve-Gear for SteamEngines, of which the following is a specication.

This invention relates to improved valves and valve-gear for steam-engines, whereby a 1o very sensitive automatic adjustment of the expansion by means of the governor without any detrimental action on the latter is insured, while at the same time a very suddenand precise cut-off is effected in such manner that it I5 is rendered possible without diiculty to enable high-pressure engines of present construction to work in any desired manner, according to the work to be performed, without detriment to the action of the valve-gear.

The accompanying drawings show the improved valves and valve-gear applied to a horizontal engine. Figure l shows a front view back of the valve; Fig. 2, a cross-section without the steam-cylinder and slide-casing; and Fig. 3 shows a sectional plan ofthe whole arrangement of the valves and valve-gear on line w fr, Fig. l. Figs. 4, 5, and 6 show, respectively, a front view, cross-section, and sectional plan of a modication of the arrangement shown in Figs. 1,2, and 3. Figs. 7 and 7, show, respectively, a front and side view of the oscillating slide.

The improved construction of valves and `valve-gear has for its main slide the usual form 3 5 of flat slide with through-passages on the back of which works an expansion'slide similar to that of the Meyer expansion-gear; but it differs from this,on the one hand,in peculiar arrangements whereby the cut-off is eected by 4o the expansion-slide in a sudden manner irrespective of the motion of the engine and the action of the governor, which arrangement has not been carried out before. On the other hand it differs in the use of a tapered cylindrical body or disk acted upon directly by the governor, the surfaces of which disk are caused to act upon the expansion-slide in such Inanner that the cut-off is automatically adj usted, so that according to the form of taper of the 5o said disk the manner in which the engine (No model.)

works can be modified so as to adapt itself to any special purpose without detriment to the proper action of the valvegear.

Vithin the valve-chest B of the cylinder A is the main slide D, similar to an ordinary D- slide with throughpassages, and which receives its motion. in the known manner from an eccentric on the crank-shaft. dis the sliderod. On this slide works the expansion-slide E, which is actuated in the following manner 6o by the governor, in combination with the motion of theslide D for suddenly closing the steam-passages. The slide E has rack -teeth e, formed on its back, into which gear the teeth of a sector, F, whose spindle j' is carried in 65 bearings f f', fixed on the slide D.

The scctor'F has lateral projections f 2 f2, on which are formed straight lat surfaces lying in the direction of the slides motion, and against these surfaces bear blade-springs fafJ 7o in such manner that the sector F has a tend ency to return to a position at right angles to the slidess motion, in which position the slide E closes the steam-passages d dl of the slide D. The sector F is extended beyond its axis, and terminates in an arm or lever, f4, with opposite inclines, which passes through a slot in the slidechest cover b into a box, G, Xed steam-tight on the latter. Viithin this box is a shaft, h, actuatedby the governor, and pre Se vented from moving longitudinally by the bearing r and adjustable ring r, which shaft carries a disk, H, having tapered or wedgeshaped side faces. lllhis disk being tapered in the same direction on both sides, as described, 8 5 presents gradually increasing and decreasing thicknesses of its periphery, and is situated in the path of the lever f 4, as this moves to and fro with the slide, so that at each motion of the slide and lever the latter comes in contact go with the disk H, which consequently turns the sector on its axis and causes it to move the slide E, so as to uncover either the passage d or d ofthe slide D, and to keep it open until the lever in traveling becomes freed from the disk H again, against which it slides. The springs f3 then act upon the sector F and cause it suddenly to assume its normal position again, in which the expansion-slide E closes the steampassages, and thus effect a sudden cut-off.

IOO

According to the variations in the speed of the governor, the shaft It is turned more or less, so as tobring awder or a narrower part of the periphery of the disk H to act upon the lever f4 of the sector, which is thus depressed for a longer or shorter space of time, so that the cut-off .and expansion is automatically and accurately regulated by the governor.

Instead of making the expansion-slide E flat, it may be formed as the segment of a circle, working on a correspondingly hollow curved face on the slide D, as shown at E, Figs. 4 to 7a, and formed with lateral guidingflanges. The arrangement of the surfaces f 2 fZ for the springs f3f3, as also of the tapered disk H, is similar to that above described, the sector F being, however, replaced by the slide E itself, thus avoiding the toothed gearing.

It will be evident that the above-described invention may be used with other .forms of expansion, slide, or lift valves besides those shown, with the exception of ball-valvesthat is to say, any arrangement in which a reciprocating main slide carries a iat or cylin drical slide or lift valve, the relative movement of which opens and closes the steam-pas sages of the main valve.

Having thus described my invention, and also the manner how and the means with which it is to be performed,what I claim as new and of my invention, and desire to secure by Letters Patent of the United States, is the followlng:

1. The combination of a reciprocating main slide-valve provided with steam-passages, a separate cutsoff valve traveling with the main valve, springs normally holding the cut-off valve over the steam-passages, an adjustable disk governing the movements of the eut-off valve, and an arm operatively connected to thesaid cut-off valve and striking against the said disk at certain points in the valve-stroke, substantially as set forth.

2. The combination of a reciprocating main slide-valve provided with steampassages, a separate cutoff valve provided with a rack and traveling f with the main valve, springs normally holding the cutoff valve over the steam-passages, an adjustable disk governing the movements of the cut oft' valve, and a toothed sector pivoted to the main valve and gearing into the said rack, and provided with an arm which strikes against the said disk at certain points in the valve-stroke, substantially as set forth.

3. The combination of a reciprocating main slide-valve provided with steam-passages, a separate cutoff valve provided with a rack and traveling with the main valve, a toothed sector pivoted to the main valve and gearing into the said rack, and provided with a rearwardly-projecting arm and flat projections in line with the slide-valve, the springs secured to the main valve and bearing against the said fiat projections, and an adjustable disk for the said arm to strike against at certain points of the valve-stroke, substantially as and for the pur pose set forth.

4:. The combination of a reciprocating main slide-valve provided with steain-passages, a separate cut-oft' valve provided with a rack and traveling with the main valve, a toothed sector pivoted to the main valve and gearing into the said rack, and provided with a rear- AWardlyprojecting arm and flat projections in line with the slide-valve, the springs secured to the main valve and bearing against the said flat projections, a revoluble shaft operated by the engine-governor and working steamtight in a casing behind the valve, and a tapered disk secured upon the revolnble shaft for the said arm t0 strike against at certain points of thel OTTO NOLL.

Vit-nesses:

PAUL BRENNICKE, MARI M. ROTTEN. 

